Σσ ⟵ {\displaystyle \longleftarrow } 19 ⟶ {\displaystyle \longrightarrow } Υυ Pronunciation IPA (key): /taʊ/ or /tɔː/ Audio (US)(file) Noun Singular tau Plural taus Nineteenth letter of Greek. Ττ. The Simple English Wikipedia has an article on: Tau Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads